Chat Input Command Support

[itohatweb]

Support all arguments

• SUB_COMMAND
• SUB_COMMAND_GROUP 
• STRING
• INTEGER
• BOOLEAN
• USER
• CHANNEL
• ROLE
• MENTIONABLE
• NUMBER
• ATTACHMENT

Support special argument guards

• channel_types
• min_value
• max_value
• min_length
• max_length
• autocomplete

Utilities

• Type guards for mentionables (is user or role)